EP1950379A1 - Method for modular balancing of a turbomachine rotor - Google Patents
Method for modular balancing of a turbomachine rotor Download PDFInfo
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- EP1950379A1 EP1950379A1 EP08100620A EP08100620A EP1950379A1 EP 1950379 A1 EP1950379 A1 EP 1950379A1 EP 08100620 A EP08100620 A EP 08100620A EP 08100620 A EP08100620 A EP 08100620A EP 1950379 A1 EP1950379 A1 EP 1950379A1
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- module
- rotor
- unbalance
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000000295 complement effect Effects 0.000 claims abstract description 22
- 230000007547 defect Effects 0.000 claims abstract description 13
- 230000009897 systematic effect Effects 0.000 claims abstract description 3
- 238000012937 correction Methods 0.000 claims description 16
- 238000005304 joining Methods 0.000 claims description 2
- 238000003032 molecular docking Methods 0.000 description 9
- 238000005259 measurement Methods 0.000 description 5
- 238000006467 substitution reaction Methods 0.000 description 5
- 230000005484 gravity Effects 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 238000012550 audit Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000012549 training Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/02—Blade-carrying members, e.g. rotors
- F01D5/027—Arrangements for balancing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/14—Determining imbalance
- G01M1/16—Determining imbalance by oscillating or rotating the body to be tested
- G01M1/24—Performing balancing on elastic shafts, e.g. for crankshafts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/80—Diagnostics
Definitions
- the present invention relates to the field of turbomachines and gas turbine engines in particular.
- a turbomachine includes rotors which are generally made of a plurality of separately manufactured and mechanically assembled members.
- a gas turbine engine thus comprises one or more rotor assemblies each consisting of a compressor and a turbine. To provide flexibility in engine maintenance, the assemblies consist of interchangeable modules.
- rotor is associated a compressor module to a turbine module. As part of a repair, for example, it is possible to replace the compressor module, respectively turbine, of the rotor with another module.
- This modular structure of turbomachines involves a prior balancing of each module. It is indeed desirable not to have to rebalance the complete rotor after the substitution of one module by another.
- a modular rotor balancing method has thus been devised which allows the standard change of parts balanced by this method without having to rebalance the rotor.
- This method for a gas turbine engine rotor consisting of a compressor module and a turbine unit therefore consists in separately balancing the modules when they are assembled with equivalent or replacement turbine or compressor replacement modules respectively.
- Equivalent complementary modules also called substitution masses, represent by their length, their mass and the position of their center of gravity the complementary part in the rotor of the part to be balanced.
- Such a set is mounted on a balancing machine which makes it possible to determine the unbalance and which provides the indications on the correction to be made in the correction planes of the module, that is to say the mass and its position in the plane: radius and angle.
- Bt is the total unbalance of the rotor composed of the assembly formed by the module and the equivalent complementary module. Its characteristics are provided by the balancer.
- Bp is the intrinsic imbalance of the rotor to be balanced resulting from the inhomogeneity of the materials, the lack of assembly of the parts which constitute it, and the distribution of the blades as well. This imbalance is fixed but unknown. We try to correct it.
- Bg is the geometrical imbalance. It is generated by the lack of perpendicularity of the junction face of the module to be balanced with respect to its axis of rotation and which is highlighted by the substitution module. This imbalance is fixed. It is known by the geometric characterization that is systematically carried out for mounting the module. We try to correct it.
- Bo is the unbalance of the tooling that is to say all the unbalance generated by the defects of the equivalent module, rotating tools and training. These unbalances are canceled by the tool return operation. It is recalled that this operation consists in making a first unbalance measurement at 0 ° with respect to the reference plane passing through the axis, and a second measurement of the assembly mounted on the tool by turning it 180 ° relative to the reference plane.
- Ba is the docking unbalance of the add-on. It is generated by the eccentricity caused by the lack of docking of the complementary module on the module to be balanced. It is variable and unknown. Its amplitude must be determined in order to know its influence on the balancing of the rotor as a whole. It is a parasitic unbalance which introduces an error during the modular balancing with a complementary module or mass of substitution. More particularly, this defect is variable from one assembly to another, it is not known and can not be corrected by the return operation with respect to the tooling. The non-repetitiveness of this type of defect is explained by the variation of the conditions from one mounting to another, for example the temperature may vary, clamping and positioning may also vary.
- the objective of the present invention is therefore to find an improved modular balancing method according to which the harmful effects of the docking faults of the complementary modules and tools are eliminated.
- An equivalent complementary module is defined in such a way that the two modules form a rotor equivalent to said rotor by assembly along the junction plane,
- the length of the short journal is determined so that the axis of the short rotor is eccentric with respect to the axis of the module of a variable value depending on the rotor and the balancing tolerance
- the invention is based on the replacement of the actual complementary module by a calculated theoretical complementary module whose characteristics are introduced for determining the unbalance to be corrected.
- each return operation with respect to the tooling is avoided to accumulate the errors introduced by the type B docking defects reported above.
- the solution of the invention also has the following advantages.
- the method using short journals, which are less demanding in machining precision, is more economical than the conventional method.
- a gas turbine engine rotor For example, this is a high pressure rotor of a double-body engine.
- the rotor 1 is composed of a first module and a second module the first module here is the compressor 10 and the second module is the turbine 20. They each comprise a bearing support pin 12 and 22 respectively and a junction plane, 14 and 24. the rotor rotates about its axis of rotation AA passing through the bearings 12 and 22. each of the modules is obtained by stacking elementary components. Due to manufacturing tolerances, the junction planes 14 and 24 by which the two modules are assembled and bolted are not perfectly perpendicular to their own axis of rotation. It follows the assembly eccentricity e, exaggerated in the figure
- the module 20 comprises on one side the journal forming the support of the bearing 22 and, on the other a junction face 24 with means of attachment to the equivalent complementary compressor module.
- An equivalent compressor module 10 ' is mounted on the turbine module 20 by fixing it at one end 14' to the junction face 24 of the turbine module 20.
- This module 10 ' comprises a trunnion at its other end for mounting a bearing 12 '.
- This complementary module in this case a compressor, equivalent to 10 ', is mechanically substituted for the compressor of the rotor in terms of dynamic behavior for balancing.
- its length is defined so that the distance between the two bearings 12 'and 22 is that of the motor. Its mass and center of gravity are the same as those of the compressor 10.
- the assembly is supposed perfect.
- this set is placed in a balancer, known per se.
- the total unbalance measured corresponds to the intrinsic imbalance of the module plus its geometrical unbalance due to the defect of perpendicularity and the unbalanced tooling. The latter is eliminated by the return operation.
- Two reference planes Pr1 and Pr2 are defined with respect to the junction plane 24 of the module 20 and a reference axis Ar perpendicular to the plane 24.
- a probe Pa of a three-dimensional measuring machine measures the position of the bearing support journal 22. The measurement of the deviation of the axis of the journal from the reference axis is thus obtained.
- the piece unbalance is determined as follows.
- a simple short pin is placed on the module to be balanced.
- a short journal 40 on a turbine module 20. It comprises a junction face 44 for mounting on the junction face 24 of the module and it comprises a cylindrical surface forming a support for a bearing 42.
- the axis between the two bearings 44 and 22 is almost identical with the axis of the module.
- the eccentricity measured at the junction plane between the two axes is variable depending on the type of rotor and the balancing tolerance.
- the purpose of mounting this short journal is to eliminate the influence of the geometric defect.
- the unbalance measured corresponds to the unbalance piece Bp as reported in the preamble of the present application.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Testing Of Balance (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
La présente invention concerne le domaine des turbomachines et des moteurs à turbine à gaz en particulier.The present invention relates to the field of turbomachines and gas turbine engines in particular.
Une turbomachine comprend des rotors qui sont généralement constitués d'une pluralité d'éléments fabriqués séparément et assemblés mécaniquement. Un moteur à turbine à gaz comprend ainsi un ou plusieurs ensembles rotoriques constitués chacun d'un compresseur et d'une turbine. Pour assurer une certaine flexibilité dans l'entretien des moteurs, les ensembles sont constitués en modules interchangeables. Pour un rotor de moteur à turbine à gaz on associe un module de compresseur à un module de turbine. Dans le cadre d'une réparation par exemple on peut ainsi remplacer le module compresseur, respectivement turbine, du rotor par un autre module.A turbomachine includes rotors which are generally made of a plurality of separately manufactured and mechanically assembled members. A gas turbine engine thus comprises one or more rotor assemblies each consisting of a compressor and a turbine. To provide flexibility in engine maintenance, the assemblies consist of interchangeable modules. For a gas turbine engine rotor is associated a compressor module to a turbine module. As part of a repair, for example, it is possible to replace the compressor module, respectively turbine, of the rotor with another module.
Cette structure modulaire des turbomachines implique un équilibrage préalable de chaque module. Il est en effet souhaitable de ne pas avoir à rééquilibrer le rotor complet après la substitution d'un module par un autre.This modular structure of turbomachines involves a prior balancing of each module. It is indeed desirable not to have to rebalance the complete rotor after the substitution of one module by another.
On a ainsi conçu une méthode d'équilibrage modulaire de rotor qui permet le changement standard des pièces équilibrées par cette méthode sans avoir à rééquilibrer le rotor.A modular rotor balancing method has thus been devised which allows the standard change of parts balanced by this method without having to rebalance the rotor.
Cette méthode pour un rotor de moteur à turbine à gaz constitué d'un module compresseur et d'un module turbine, consiste donc à équilibrer séparément les modules quand ils sont assemblés avec des modules complémentaires équivalents ou de substitution de turbine respectivement de compresseur. Les modules complémentaires équivalents, désignés également masses de substitution, représentent par leur longueur, leur masse et la position de leur centre de gravité la partie complémentaire, dans le rotor, de la pièce à équilibrer. On monte un tel ensemble sur une machine à équilibrer qui permet d'en déterminer le balourd et qui fournit les indications sur la correction à apporter dans les plans de correction du module, c'est-à-dire la masse et sa position dans le plan : rayon et angle.This method for a gas turbine engine rotor consisting of a compressor module and a turbine unit, therefore consists in separately balancing the modules when they are assembled with equivalent or replacement turbine or compressor replacement modules respectively. Equivalent complementary modules, also called substitution masses, represent by their length, their mass and the position of their center of gravity the complementary part in the rotor of the part to be balanced. Such a set is mounted on a balancing machine which makes it possible to determine the unbalance and which provides the indications on the correction to be made in the correction planes of the module, that is to say the mass and its position in the plane: radius and angle.
Avec cette méthode on équilibre les deux modules comme s'ils étaient assemblés à des modules complémentaires parfaits. Cependant il apparaît que des défauts d'accostage des modules, des modules complémentaires équivalents et des outillages faussent l'équilibrage. Ces défauts sont dus au défaut de perpendicularité de la face de jonction du module à équilibrer par rapport à son axe de rotation.With this method we balance the two modules as if they were assembled to perfect complementary modules. However, it appears that docking faults of modules, equivalent complementary modules and tools distort the balancing. These defects are due to lack of perpendicularity of the junction face of the module to be balanced with respect to its axis of rotation.
Lors de l'équilibrage du module ensemble avec le module complémentaire équivalent on peut dissocier plusieurs balourds. Tel que mis en évidence par une machine équilibreuse le balourd total peut être décomposé selon la somme vectorielle suivante :
Bt est le balourd total du rotor composé de l'ensemble formé par le module et le module complémentaire équivalent. Ses caractéristiques sont fournies par l'équilibreuse.Bt is the total unbalance of the rotor composed of the assembly formed by the module and the equivalent complementary module. Its characteristics are provided by the balancer.
Bp est le balourd intrinsèque du rotor à équilibrer résultant de la non homogénéité des matériaux, du défaut de montage des pièces qui le constituent, et de la répartition des aubes aussi. Ce balourd est fixe mais inconnu. On cherche à le corriger.Bp is the intrinsic imbalance of the rotor to be balanced resulting from the inhomogeneity of the materials, the lack of assembly of the parts which constitute it, and the distribution of the blades as well. This imbalance is fixed but unknown. We try to correct it.
Bg est le balourd géométrique. Il est engendré par le défaut de perpendicularité de la face de jonction du module à équilibrer par rapport à son axe de rotation et qui est mis en évidence par le module de substitution. Ce balourd est fixe. Il est connu par la caractérisation géométrique que l'on effectue systématiquement pour le montage du module. On cherche à le corriger.Bg is the geometrical imbalance. It is generated by the lack of perpendicularity of the junction face of the module to be balanced with respect to its axis of rotation and which is highlighted by the substitution module. This imbalance is fixed. It is known by the geometric characterization that is systematically carried out for mounting the module. We try to correct it.
Bo est le balourd de l'outillage c'est-à-dire l'ensemble des balourds engendrés par les défauts du module équivalent, des outillages tournants ainsi que de l'entraînement. Ces balourds sont annulés par l'opération de retourne de l'outillage. On rappelle que cette opération consiste à effectuer une première mesure de balourd à O° par rapport au plan de référence passant par l'axe, et une seconde mesure de l'ensemble monté sur l'outillage en le retournant à 180° par rapport au plan de référence.Bo is the unbalance of the tooling that is to say all the unbalance generated by the defects of the equivalent module, rotating tools and training. These unbalances are canceled by the tool return operation. It is recalled that this operation consists in making a first unbalance measurement at 0 ° with respect to the reference plane passing through the axis, and a second measurement of the assembly mounted on the tool by turning it 180 ° relative to the reference plane.
Ba est le balourd d'accostage du module complémentaire. Il est engendré par l'excentricité provoquée par le défaut d'accostage du module complémentaire sur le module à équilibrer. Il est variable et inconnu. Son amplitude doit être déterminée afin de connaître son influence sur l'équilibrage du rotor dans son ensemble. C'est un balourd parasite qui introduit une erreur lors de l'équilibrage modulaire avec un module complémentaire ou masse de substitution. Plus particulièrement ce défaut est variable d'un montage à l'autre, il n'est pas connu et ne peut être corrigé par l'opération de retourne par rapport à l'outillage. La non répétitivité de ce type de défaut s'explique par la variation des conditions d'un montage à l'autre, par exemple la température peut varier, le serrage et le positionnement peuvent également varier. Il s'agit donc d'un balourd parasité qu'il est nécessaire de maintenir inférieur à une valeur minimale pour que la méthode d'équilibrage modulaire donne des résultats exploitables. Notamment si l'excentricité provenant de ce défaut est de même importance que l'excentricité provenant du défaut géométrique de la face de jonction du module, ce dernier peut être minimisé ou augmenté sans qu'on puisse l'anticiper. Un tel défaut est donc susceptible d'engendrer une valeur en excès ou en défaut, en fonction des circonstances du montage, du balourd correcteur appliqué avec la méthode d'équilibrage modulaire.Ba is the docking unbalance of the add-on. It is generated by the eccentricity caused by the lack of docking of the complementary module on the module to be balanced. It is variable and unknown. Its amplitude must be determined in order to know its influence on the balancing of the rotor as a whole. It is a parasitic unbalance which introduces an error during the modular balancing with a complementary module or mass of substitution. More particularly, this defect is variable from one assembly to another, it is not known and can not be corrected by the return operation with respect to the tooling. The non-repetitiveness of this type of defect is explained by the variation of the conditions from one mounting to another, for example the temperature may vary, clamping and positioning may also vary. It is therefore a parasitic unbalance that must be kept below a minimum value for the modular balancing method to give usable results. In particular, if the eccentricity originating from this defect is of the same importance as the eccentricity originating from the geometric defect of the junction face of the module, the latter can be minimized or increased without being able to be anticipated. Such a defect is therefore likely to generate a value in excess or in default, depending on the circumstances of the assembly, the corrective unbalance applied with the modular balancing method.
En résumé le défaut d'accostage est non prévisible et non répétitif. Il parasite l'équilibrage modulaire et fausse les résultats.In summary, the lack of docking is unpredictable and non-repetitive. It parasitizes the modular balancing and distorts the results.
L'objectif de la présente invention est donc de trouver une méthode d'équilibrage modulaire améliorée selon laquelle les effets néfastes des défauts d'accostage des modules complémentaires et des outillages sont supprimés.The objective of the present invention is therefore to find an improved modular balancing method according to which the harmful effects of the docking faults of the complementary modules and tools are eliminated.
Conformément à l'invention on parvient à remédier à ce problème. Le procédé d'équilibrage selon l'invention d'un premier module de turbomachine, comprenant le long d'un axe de rotation un plan de palier d'un côté et un plan de jonction de l'autre, par rapport à un rotor comprenant ledit module, selon lequelAccording to the invention it is possible to remedy this problem. The balancing method according to the invention of a first turbomachine module, comprising, along an axis of rotation, a bearing plane on one side and a joining plane of the other, with respect to a rotor comprising said module, according to which
On définit un module complémentaire équivalent, de telle façon que les deux modules forment un rotor équivalent audit rotor par assemblage le long du plan de jonction,An equivalent complementary module is defined in such a way that the two modules form a rotor equivalent to said rotor by assembly along the junction plane,
On détermine le balourd total dudit rotor équivalent et la correction correspondante à apporter sur ledit module,
est caractérisé par le fait qu'il comprend les étapes suivantes :
- On détermine le défaut de concentricité du palier du premier module par rapport à l'axe perpendiculaire au plan de jonction,
- On calcule le balourd géométrique théorique engendré par ledit module complémentaire équivalent et résultant dudit défaut de concentricité,
- On monte un tourillon court sur le premier module du côte du plan de jonction pour former un rotor court dont l'axe de rotation est sensiblement confondu avec l'axe du module, et on mesure le balourd du rotor court.
- On détermine le balourd dudit module en ajoutant au balourd du rotor un balourd systématique correspondant audit balourd géométrique théorique.
is characterized in that it comprises the following steps:
- The concentricity defect of the bearing of the first module is determined relative to the axis perpendicular to the junction plane,
- The theoretical geometrical unbalance generated by the said equivalent complementary module and resulting from the said lack of concentricity is calculated,
- A short trunnion is mounted on the first module on the side of the junction plane to form a short rotor whose axis of rotation is substantially coincides with the axis of the module, and the unbalance of the short rotor is measured.
- The unbalance of said module is determined by adding to the unbalance of the rotor a systematic unbalance corresponding to said theoretical geometric unbalance.
Plus particulièrement la longueur du tourillon court est déterminée de façon que l'axe du rotor court soit excentré par rapport à l'axe du module d'une valeur variable en fonction du rotor et de la tolérance d'équilibrageMore particularly the length of the short journal is determined so that the axis of the short rotor is eccentric with respect to the axis of the module of a variable value depending on the rotor and the balancing tolerance
Ainsi l'invention repose sur le remplacement du module complémentaire réel par un module complémentaire théorique calculé dont on introduit les caractéristiques pour la détermination du balourd à corriger. Par ce moyen on tient compte lors de l'équilibrage du module, de l'influence d'un module complémentaire parfait, monté sans défaut d'accostage.Thus the invention is based on the replacement of the actual complementary module by a calculated theoretical complementary module whose characteristics are introduced for determining the unbalance to be corrected. By this means we take into account when balancing the module, the influence of a perfect complementary module, mounted without docking fault.
Par exemple par cette méthode on évite à chaque opération de retourne par rapport à l'outillage de cumuler les erreurs introduites par les défauts d'accostage de type Ba rapportés plus haut.For example, by this method, each return operation with respect to the tooling is avoided to accumulate the errors introduced by the type B docking defects reported above.
Bien que visant plus particulièrement les rotors de moteur à turbine à gaz l'invention s'applique à tout type d'équilibrage et pour tout partie de rotor que l'on cherche à rendre modulaire.Although aimed more particularly gas turbine engine rotors the invention applies to any type of balancing and any rotor part that is sought to make modular.
La solution de l'invention présente en outre les avantage suivants.The solution of the invention also has the following advantages.
Elle permet la réalisation d'un équilibrage modulaire précis. Sa précision ne dépend que de la précision de l'équilibreuse utilisée et des mesures de concentricité effectuées.It allows the realization of a precise modular balancing. Its accuracy depends only on the precision of the balancing machine used and the concentricity measurements made.
Elle permet d'effectuer les opérations d'équilibrage avec un gain de temps par rapport à la méthode d'équilibrage modulaire de l'art antérieur. Ce gain de temps est lié à :
- La réaction du rotor face aux masses appliquées lors de l'opération de correction. Avec un module complémentaire réel on a une grande instabilité résultant d'une mauvaise séparation de plan. Avec un tourillon court au contraire, le rotor reste stable et la correction apportée dans un plan de correction a peu d'influence dans l'autre plan. Cela résulte d'une bonne séparation de plan.
- L'accessibilité du plan de correction à travers le tourillon court. En raison de la faible longueur du tourillon court par rapport à celle d'un module complémentaire, l'accessibilité est meilleure.
- La précision d'accostage pour un tourillon court est moins contraignante qu'avec un module complémentaire.
- The reaction of the rotor with the masses applied during the correction operation. With a real supplementary module, there is a great instability resulting from a bad plan separation. With a short trunnion on the contrary, the rotor remains stable and the correction made in one plane of correction has little influence in the other plane. This results from a good plan separation.
- The accessibility of the correction plan through the short trunnion. Because of the short length of the short journal relative to that of a complementary module, the accessibility is better.
- The docking accuracy for a short journal is less compelling than with an add-on.
Il serait possible par ailleurs de supprimer l'opération de retourne outillage avec une équilibreuse pourvue d'outillages courts légers et équilibrés.It would also be possible to eliminate the return tooling operation with a balancer provided with light and balanced short tooling.
La méthode, en employant des tourillons courts, qui sont moins exigeants en précision d'usinage, est plus économique que la méthode conventionnelle.The method, using short journals, which are less demanding in machining precision, is more economical than the conventional method.
On décrit maintenant ci-après l'invention plus en détail en référence aux dessins annexés sur lesquels
- La
figure 1 représente schématiquement un rotor de moteur à turbine à gaz avec ses deux modules - La
figure 2 représente schématiquement le montage d'un module complémentaire équivalent sur un module de turbine pour l'équilibrage modulaire ; - La
figure 3 montre le principe de mesure de l'excentricité sur un module ; - La
figure 4 montre un module de turbine sur lequel on a monté un tourillon court ; - La
figure 5 représente un diagramme sur lequel figure le balourd total à corriger sur deux plans de correction C1 et C2.
- The
figure 1 schematically represents a gas turbine engine rotor with its two modules - The
figure 2 schematically represents the mounting of an equivalent complementary module on a turbine module for modular balancing; - The
figure 3 shows the principle of measuring eccentricity on a module; - The
figure 4 shows a turbine module on which a short trunnion has been mounted; - The
figure 5 is a diagram showing the total unbalance to be corrected on two correction planes C1 and C2.
Sur la
On a représenté sur la
Pour l'opération d'équilibrage du module 20, on place cet ensemble dans une équilibreuse, connue en soi. Le balourd total mesuré correspond au balourd intrinsèque du module plus son balourd géométrique dû au défaut de perpendicularité et au balourd outillage. Ce dernier est éliminé par l'opération de retourne.For the balancing operation of the
On a représenté sur la figure, un montage sans défaut. Cependant comme expliqué plus haut selon les circonstances du montage s'ajoute au balourd géométrique un balourd dit d'accostage que l'on ne peut maîtriser et qui vient soit minimiser soit surestimer le balourd.There is shown in the figure, a flawless assembly. However, as explained above according to the circumstances of the assembly is added to the geometrical unbalance unbalance said docking that can not be controlled and that either minimizes or overestimates the unbalance.
Pour palier ce problème conformément à l'invention on calcule un balourd géométrique théorique et on procède à la détermination du balourd en tenant compte de celui-ci.To overcome this problem in accordance with the invention a theoretical geometrical imbalance is calculated and the unbalance is determined taking into account it.
Dans ce but on procède à la détermination de l'excentricité résultant du défaut de perpendicularité du plan de jonction.For this purpose we proceed to the determination of the eccentricity resulting from the lack of perpendicularity of the junction plane.
On voit sur la
On définit deux plans de référence Pr1 et Pr2 par rapport au plan de jonction 24 du module 20 ainsi qu'un axe de référence Ar perpendiculaire au plan 24. Un palpeur Pa d'une machine de mesure tridimensionnelle mesure la position du tourillon support de palier 22. on obtient ainsi la mesure de l'écart de l'axe du tourillon par rapport à l'axe de référence.Two reference planes Pr1 and Pr2 are defined with respect to the
Pour la mesure de cette excentricité on peut par exemple mettre en oeuvre la méthode développée sous le nom Genspect par General Electric.For the measurement of this eccentricity can for example implement the method developed under the name Genspect by General Electric.
Connaissant la valeur de l'excentricité on détermine le balourd géométrique de la masse de substitution ou module complémentaire équivalent à partir de la connaissance de son centre de gravité et de sa masse. Le balourd est exprimé en cm. gKnowing the value of the eccentricity is determined the geometrical unbalance of the mass of substitution or equivalent complementary module from the knowledge of its center of gravity and its mass. The unbalance is expressed in cm. boy Wut
On procède à la détermination du balourd pièce de la façon suivante.The piece unbalance is determined as follows.
Au lieu d'un module complémentaire réel, on place un simple tourillon court sur le module à équilibrer. On voit sur la
L'objectif visé par le montage de ce tourillon court est d'éliminer l'influence du défaut géométrique. Le balourd mesuré correspond au balourd pièce Bp tel que rapporté dans le préambule de la présente demande.The purpose of mounting this short journal is to eliminate the influence of the geometric defect. The unbalance measured corresponds to the unbalance piece Bp as reported in the preamble of the present application.
On obtient le balourd total du module de turbine 20 par la somme vectorielle
Dans un rotor de turbomachine on a en général deux plans de correction par module.In a turbomachine rotor there are generally two correction planes per module.
On a représenté sur le diagramme de la
Claims (2)
on définit un module complémentaire équivalent, de telle façon que les deux modules forment un rotor équivalent audit rotor par assemblage le long du plan de jonction (24),
on détermine le balourd total dudit rotor équivalent et la correction correspondante à apporter sur le dit module,
caractérisé par le fait qu'il comprend les étapes suivantes
On détermine le défaut de concentricité du palier (22) du premier module (20) par rapport à l'axe perpendiculaire au plan de jonction (24) ;
On calcule le balourd géométrique théorique dudit module complémentaire équivalent,
On monte un tourillon court (40) sur le premier module du côte du plan de jonction (24) pour former un rotor court dont l'axe de rotation est sensiblement confondu avec l'axe du module (20) et on mesure le balourd du rotor court,
On détermine le balourd total dudit module en ajoutant au balourd du rotor court un balourd systématique correspondant au balourd géométrique.Method for balancing a first turbomachine module (20), comprising along one axis of rotation a bearing plane (22) on one side and a joining plane (24) on the other side, relative to a rotor (1) comprising said module (20), according to which
an equivalent complementary module is defined in such a way that the two modules form a rotor equivalent to said rotor by assembly along the junction plane (24),
the total unbalance of said equivalent rotor is determined and the corresponding correction to be made on said module,
characterized by the fact that it comprises the following steps
The concentricity defect of the bearing (22) of the first module (20) is determined relative to the axis perpendicular to the junction plane (24);
The theoretical geometric unbalance of said equivalent complementary module is calculated,
A short journal (40) is mounted on the first module on the side of the junction plane (24) to form a short rotor whose axis of rotation is substantially coincident with the axis of the module (20) and the unbalance of the module is measured. short rotor,
The total unbalance of said module is determined by adding to the unbalance of the short rotor a systematic unbalance corresponding to the geometrical unbalance.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0700595A FR2911959B1 (en) | 2007-01-29 | 2007-01-29 | METHOD FOR MODULAR TURBOMACHINE ROTOR BALANCING |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1950379A1 true EP1950379A1 (en) | 2008-07-30 |
EP1950379B1 EP1950379B1 (en) | 2009-10-07 |
Family
ID=38377305
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08100620A Active EP1950379B1 (en) | 2007-01-29 | 2008-01-18 | Method for modular balancing of a turbomachine rotor |
Country Status (7)
Country | Link |
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US (1) | US7555939B2 (en) |
EP (1) | EP1950379B1 (en) |
JP (1) | JP5147001B2 (en) |
CA (1) | CA2619606C (en) |
DE (1) | DE602008000182D1 (en) |
FR (1) | FR2911959B1 (en) |
RU (1) | RU2443868C2 (en) |
Cited By (1)
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CN110598229A (en) * | 2019-01-07 | 2019-12-20 | 哈尔滨工业大学 | Large-scale high-speed rotation equipment multi-stage part optimization method based on Monte Carlo deviation evaluation |
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EP1870988A1 (en) * | 2006-06-22 | 2007-12-26 | ALSTOM Technology Ltd | Method and device for balancing a rotor of an electrical machine |
JPWO2008072307A1 (en) * | 2006-12-12 | 2010-03-25 | 東芝ストレージデバイス株式会社 | Balance correction apparatus and method |
US7685876B2 (en) * | 2006-12-20 | 2010-03-30 | General Electric Company | Methods and systems for balancing a rotatable member |
GB2481582A (en) * | 2010-06-28 | 2012-01-04 | Rolls Royce Plc | A method for predicting initial unbalance in a component such as a blisk |
JP5944295B2 (en) * | 2012-10-26 | 2016-07-05 | 株式会社東芝 | Low speed balance method and low speed balance device |
US9334739B2 (en) | 2013-08-08 | 2016-05-10 | Solar Turbines Incorporated | Gas turbine engine rotor assembly optimization |
US9932832B2 (en) | 2014-05-29 | 2018-04-03 | Pratt & Whitney Canada Corp. | Method of balancing a spool of a gas turbine engine |
FR3038382B1 (en) * | 2015-07-01 | 2017-07-07 | Snecma | TOOLS FOR BALANCING A TURBOMACHINE MODULE |
GB2571707A (en) * | 2018-02-28 | 2019-09-11 | Rolls Royce Plc | Modular rotor balancing |
CN113323920B (en) * | 2021-01-18 | 2023-05-09 | 中国民用航空飞行学院 | Engine fan blade replacement and fan rotor static rebalancing adjustment method |
CN115356100B (en) * | 2022-10-20 | 2023-01-03 | 沈阳新松机器人自动化股份有限公司 | Detection mechanism for balance module |
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- 2008-01-18 DE DE602008000182T patent/DE602008000182D1/en active Active
- 2008-01-24 US US12/019,076 patent/US7555939B2/en active Active
- 2008-01-25 JP JP2008014582A patent/JP5147001B2/en active Active
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Also Published As
Publication number | Publication date |
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FR2911959B1 (en) | 2009-04-24 |
DE602008000182D1 (en) | 2009-11-19 |
RU2443868C2 (en) | 2012-02-27 |
CA2619606A1 (en) | 2008-07-29 |
JP2008185032A (en) | 2008-08-14 |
JP5147001B2 (en) | 2013-02-20 |
EP1950379B1 (en) | 2009-10-07 |
US7555939B2 (en) | 2009-07-07 |
CA2619606C (en) | 2014-11-25 |
FR2911959A1 (en) | 2008-08-01 |
RU2008103105A (en) | 2009-08-10 |
US20080245138A1 (en) | 2008-10-09 |
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